# Posts by SARA

Total # Posts: 4,532

**science**

You know that a collision must be "elastic" if: The momentum of the two-object system doesn't change The sum of the final kinetic energies equals the sum of the initial kinetic energies There is no change in the internal energies of the objects (thermal energy, ...

**English/ Help**

it was B actually -.-

**science**

A hoop of mass M = 4 kg and radius R = 0.4 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...

**math**

what is the radius of convergence for the sum n=1 to infinity of 3(-1)^n(n)(x^n)?

**science**

does density affect weight?

**Math**

I don't know how to explain c. I know the next 3 terms is -19,-27,-36

**Math**

Continue the pattern for three more terms. Describe how to find the successive terms. a)12,9,6,3 b)5,6,8,11 c)3,-1,-6,-12 Please help

**Science**

Make a flowchart to show how the event m might affect a forest ecosystem. A logging company clear-cuts the trees in the forest. My question is; What are the events that might affect a forest ecosystem when clear-cutting the trees in the forest?

**POL 201 Week 4 quiz help**

Question 1.1. The Judiciary Act of 1789 established all of the following except that the Supreme Court would (Points : 1) *A) have one Chief Justice. B)have five associate justices. C)sit in two sessions each year. D)determine how many federal districts there would be. ...

**POL 201 Week 4 quiz help**

Question 1.1. The Judiciary Act of 1789 established all of the following except that the Supreme Court would (Points : 1) have one Chief Justice. have five associate justices. sit in two sessions each year. determine how many federal districts there would be. Question 2.2. ...

**Science**

How do trees decompose?

**Science**

Is a beaver a consumer or a producer and how do you know that?

**science**

and to go along with that. if velocity and mass are constant does that mean the change in magnitude of the momentum is 0?

**science**

Which way is the momentum occuring if a child is riding a merry go round at a constant speed. So for example at each 4 "sides" of the merry go round which direction is momentum . I know the velocity is always tangent to the circle at a specific point. does the ...

**math**

Use the Trapezoidal Rule, the Midpoint Rule, and Simpson's Rule to approximate the given integral with the specified value of n. (Round your answers to six decimal places.) The integral of e^(3sqrt(t)) sin3t dt from 0 to 4. n=8

**math**

An isosceles triangle has a base 9.6 units long. If the congruent side lengths have measures to the first decimal place, what is the shortest possible length of the sides?

**Eng**

What is the interpretation of the journey by Duane big eagle

**calc**

evaluate the integral from 4 to 5. (x^3 -3x^2 -9)/(x^3 -3x^2)

**science**

A car of mass 2900 kg collides with a truck of mass 4800 kg, and just after the collision the car and truck slide along, stuck together. The car's velocity just before the collision was < 34, 0, 0 > m/s, and the truck's velocity just before the collision was <...

**science**

A bullet of mass 0.062 kg traveling horizontally at a speed of 150 m/s embeds itself in a block of mass 90 kg that is sitting at rest on a nearly frictionless surface What is the speed of the block after the bullet embeds itself in the block?

**sciecne**

Two thin hollow plastic spheres, about the size of a ping-pong ball with masses (m1 = m2 = 2e-3 kg) have been rubbed with wool. Sphere 1 has a charge q1 = -6e-9 C and is at location < 40e-2, -20e-2, 0 > m. Sphere 2 has a charge q2 = -6e-9 C and is at location < -50e-2...

**Business**

Was the action of the NPA in line with its and the RBA’s Code of Conduct.

**math**

Thank you .. but the right answer in my book is 115g

**math**

How many gram ofsodiun fluoride should be added to 100000liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm

**chemistry**

Calculate the atomic mass of naturally occurring molybdenum (Mo) which contains the following isotopes. Isotope Abundance (%) Atomic mass (a.u.) 92Mo 15.8 91.91 94Mo 9.0 93.90 95Mo 15.7 94.91 96Mo 16.5 95.91 97Mo 9.5 96.91 98Mo 23.5 97.91 100Mo 9.7 99.91

**math**

If 50ml of a 7.5% (w/v) sodium bicarbonate injection are added to 500ml of a5% dextrose injection , what is the percentage strength (w/v)of sodium bicarbonate in product?

**math**

Apharmacist incorporates 6g of coal tar into 120g of a5% coal tar ointment calculate the percetage (w/w) of coal tar in finshed product

**Math**

Thank you so much !

**Math**

Can someone help me with this question? It's urgent..

**Math**

Remove one value from the following data to make each statement true. 32,45,82,99,15,102,75,15,15,75,2,75 a)The mean is 56.09 How do you know the removed value makes it true?

**Math**

Thank you

**Math**

In a skating competition, the marks of judges are randomly selected to count. Then the highest and lowest marks are dropped, and the skater receives the mean of the remaining marks. There are some of the marks that 11 judges gave a skater for a free-skating program. 6.75, 6.25...

**Math**

14

**physics**

A rifle bullet with a mass of 16.5 g traveling toward the right at 285 m/s strikes a large bag of sand and penetrates it to a depth of 22.6 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.

**POL 201 week 1 Quiz**

Question : In John Locke’s social contract, we Student Answer: submit to the absolute authority of the sovereign. INCORRECT donate all our property to the aristocracy. can rebel against the sovereign whenever we want. CORRECT exchange our absolute liberty for political ...

**POL 201 week 1 Quiz**

Question 1.1. In John Locke’s social contract, we (Points : 1) submit to the absolute authority of the sovereign. donate all our property to the aristocracy. can rebel against the sovereign whenever we want. exchange our absolute liberty for political freedom. Question 2...

**Pre algebra**

this place sucks

**physics**

a pendulum is swinging back and forth once every 1.25 second, how much longer should the pendulum be to increase its period by 0.200 second

**Geometry**

if v = (1, 2) and w = (3, -4) find the coordinates of 4v - w

**Geometry**

if the angle of rotation with respect to lines l and m measures 30 degrees, then l and m intersect to form an angle of how many degrees? is it 30 degrees?

**Geometry**

im thinking its D?

**Geometry**

which of the following applies to the graph of y = -2x + 4? a. m = -4; y-intercept = 2 b. m = 2; y-intercept = -4 c. m = 4; y-intercept = -2 d. m = -2; y-intercept = 4 thank you!

**chemistry**

Radioactive decay is a process that follows first-order kinetics. The half-life of 32P is 0.03920 years; how long (in minutes) would it take for the amount of 32P to decrease to 53.25% of its initial amount? I don't understand at all what to do here

**Chemistry**

How can I determine the overall electrochemical reaction that proceeds spontaneously? Cd2+ | Cd, Co2+ | Co 1. Cd+Co2+ −¨Cd2++Co 2. Co+Cd2+ −¨Co2++Cd (1. and 2. are answer choices)

**Chemistry**

Yes, and there is no water involved.

**Chemistry**

Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0 value. Answer in units of V Can you please explain the steps?

**physics**

the length of nylon rope from which a mountain climber is suspended has a force constant of 1.40*10^4. how much would this rope stretch to break the climbers fall if he freefall 2.00 m before the rope run out of slack

**physics**

suppose the length of a clock's pendulum is increased by 0.01 exactly at noon what time will be exactly next day by noon

**physics**

The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.00 g of condensation forms on a glass containing both water and 200 g of ice, how many grams of the ice will melt as a result? Assume no other heat transfer occurs.

**physics**

if 20g of steam at 100 c is mixed into 80 g of water at 20 c what is the final temperature if no heat lost

**Math**

What is the Schlafli Notation?

**Chemistry**

For the formation of ammonia, the equilibrium constant is known to be 5.2 × 10^−5 at 25◦C. After analysis, it is determined that [N2] =3M and [H2]=0.8M, both at equilibrium. How many grams of ammonia are in the 10L reaction vessel at equilibium? Use the ...

**Chemistry**

The compound M2X3 has a molar solubility of 0.0190 M. What is the value of Ksp for M2X3? Here are the choices: 1. 3.52 × 10^-6 2. 4.12 × 10^-5 3. 8.91 × 10^-8 4. 2.48 × 10^-9 5. 2.67 × 10^-7

**Chemistry**

So I disregard the temperature?

**Chemistry**

At 25C, an equilibrium mixture of gases con- tains 0.00680 mol/L PCl3, 0.0290 mol/L Cl2, and 0.00500 mol/L PCl5. PCl5(g) ⇀ ↽ PCl3(g) + Cl2(g) What is the equilibrium constant for the reaction? How would I do this? I'm so confused!

**grammar**

Does it have to be about a specific topic, or can we use any words? ex: Food for he letter F.

**Chemsitry**

If Kc = 6.38 × 105 for the reaction A(g) ⇀ ↽ 2B(g), what is Kc for the reaction written as 2B(g) ⇀ ↽ A(g)? How would I solve this?

**Chemistry**

NH4NO3(s) ¡æ N2O(g) + 2H2O(§¤). How much water is produced if 22.9 g of N2O is produced in this reaction? Answer in units of g I converted grams of N2O to mol. Then I did a mol ratio getting mol of H2O. Then I converted mol of H2O to grams. I got 18....

**Chemistry**

How many of the following changes would alter the numerical value of the equilibrium constant Kp for the reaction 2OF2(g) ⇀ ↽ O2(g) + 2F2(g)? I) an increase in temperature II) a decrease of the container volume III) adding more O2 at constant volume IV) adding a ...

**Manegerial accounting**

calculate the net operating income , evergreen corp has provided the following data: sales per period 1000 units ,selling price $ 40 per unit , variable manufacturing cost 12 per unit, selling expenses $5,100 pls 5% of selling price , administrative expenses $3,000 plus 20% of...

**3 physics question please help quick**

Two point charges of opposite sign are brought close together. Which statement best describes the field lines of the combined point charges? (Points : 1) The field lines from the positive charge point toward the negative charge. The field lines from the positive charge point ...

**English**

updated for any 2017 peeps; its still bcb! :)

**English**

anna is 100% correct!!!

**HELP! 5th grade math**

Thank you!! how can i explain to her how to come up with the 2265? I get 2 L and 2L and she will only know that 2L converts to 2000ml how can she figure that leftover out? sorry this stuff totally confuses me :)

**HELP! 5th grade math**

Trying to help my child in 5th grade. Shannon pours 4 different liquid ingredients into a bowl The sum of the liquid ingredients is 8.53 liters. Two of her measurements are in milliliters and two of her measurements are in liters. Give an example of possible measurements for ...

**Math**

finding the slope of the line containing points with coordinate (-2,3) and (1,-3) by the definition

**5th Grade Math**

OMGosh Please help me (mom) so I can help my daughter with this word problem!!! Cam rode her bike 5 times as far as Dante did. Dante rode 187 meters farther than Michael did. Cam rode 15.25 kilometers. How many meters did Michael ride? Explain how you got your answer......

**chemistry**

If during an experiment, only potassium channels open on a neuron, what do you expect will happen to the membrane potential? Why?

**science -heredity**

there are about 100,000 genes in each cell. Why would it be important scientists to identify what every one of these genes does? I put Genes will describe a trait of a person, example, it will determine if a person will be small or tall; blue or brown eyes and brown or blond ...

**chemistry**

Based upon the intermolecular forces present, rank the following substances according to the expected boiling point for the substance: MgF2, H2O, HCl, N2

**Physics**

What capacitance in needed in series with an 785 µH inductor to form a circuit that radiates a wavelength of 199 m?

**econ**

The terms below are measures or individual components of the money supply. Specifically considering the money supply of the United States, rank these items from largest to smallest in terms of dollar value. Currency, M2,M1,Balances in savings accounts, travelers check

**econ**

economics- what is the law called where cost of input increases so cost of output must increase (in order to keep max profit)

**chemistry**

calculate the freezing point of an aqueous solution of 15.5 grams of glucose dissolved in 150 grams of water

**physics**

the frequency of wave A is 250 hertz and the wavelength is 30 cm. the frequency of wave B is 260 hertz and the wavelength is 25 cm. which is a faster wave?

**Chemistry**

Sorry. I just want to be sure that I am doing it right.

**Chemistry**

Determine the pH of a 1.2×10^−2 M solution

**Chemistry**

What is the pH of a solution whose [H3O+] is 9.2× 10^−9 M?

**Chemistry**

Do I use: pH= -log[h30+]

**Chemistry**

Thamks! How do I determine the pH value of this solution?

**Chemistry**

A solution contains 0.00245 M HCl. Determine the [H3O+] for the solution. points Determine the [OH-]

**Chemistry**

In neutralization reactions, acid + base ¨ salt + water HCl can be neutralized with NaOH. How many moles of NaOH will it take to neutralize 0.68 L of 0.29 M HCl? Is there a formula that I need to use here?

**Chemistry**

Thank You!! I got it right! My answer is 22.10853.

**Chemistry**

You have a vinegar solution you believe to be 0.8 M. You are going to titrate 21.39 mL of it with a NaOH solution that you know to be 0.774 M. At what volume of added NaOH solution would you expect to see an end point? Answer in units of mL

**Math**

What is the solution of: u-7+(-3)=-12

**Ashford PHI 208**

1. Tom Regan’s view of animals is that (Points : 1) They are important but not quite as important as human beings They have rights, which means that they should never be used for human purposes They may be ethically used because they were bred and raised for that purpose ...

**social studies**

This is nearly impossible but I made it try your best good luck

**econ**

In the country of Ambiguostan, the government is providing salt-mine concessions to USalt & Co, but due to recent elections, will be revoking these concessions in 9 years. Since the salt business will be booming for years to come, USalt & Co is a highly traded stock and will ...

**math**

leah has three fewer than 4 times as many dvds as Sonia has. Leah has 37 dvds. how many dvds does Sonia have?

**chemistry**

how are buckeyballs,diamond, and graphite similar? how are they different?

**calculus**

Find the correct values for the equation -x^3 +bx^2 +cx + d, using this information, local min x= -5, local max (1,11). Point of inflection = -2.

**Math**

How do I use gauss-jordan to solve this? Can you explain the steps and show what you multiplied, added, subtracted, etc to each row? 8x + 2y = -68 -7x - y = 55

**physics**

11) Three point charges of magnitudes +6.0 mC, -7.0 mC, and -13 mC are placed on the x-axis at x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the force on the -13 mC charge due to the other two charges? A) -0.55 N B) -0.79 N C) 0.55 N D) 0.79 N

**accoutning**

What should I credit in this journal entry: If the owner of a company puts 50,000 of his own money into the company and gets 4,000 shares of stock. I know I need to debit cash but what do i credit? Thanks

**math**

Jason left home at 6:12 pm on march 25. He arrived back home 36 hours and 12 minutes later. What time did he arrive home?

**Math**

joe has a farm with 99 animal, four times as many cows as horses, twice as many horses as pigs. how many cows, horses and pigs are there?

**5th grade math**

thank you!!!

**5th grade math**

sue and dave shared 1/3 pound of cherries equally. What fractional part of a pound did each get? Molly wrote the following equation to solve the problem: (2 divided by 1/3) 2/1/3=n. Do you agree with Molly's equation? support your answer with information from the problem. ...

**math**

Where would you cut a board that measures 3 ft 1 1/2 in to divide it into two equal pieces?

**5th Grade Math**

Thank you so much, I had used something similar but with Pizza but apparently cake was more appealing when I explained it to her, so Thank you. Okay Now there is one that i can't even think of.........Write a Word Problem for..... 4/5 x 1/4 + 3/5 = 4/5 Sheesh! Any ...